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Got questions? We've got answers!
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Which technology do you use for making calls?
Sinch In-App Voice Calling uses the WebRTC framework - the most frequently used voice and video calling technology for IP-based communication. WebRTC combines multiple technologies to ensure the best call quality around.
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Which codec do you use, and do you use WebRTC?
Our technology supports multiple protocols, but we mostly use OPUS. It's a flexible auto-codec that adapts voice quality to suit network quality - a good connection results in HD voice quality.
The video codec we mostly use is VP8.
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What scalability options does Sinch offer?
Sinch powers all kinds of applications, from MVP prototypes to successful and widely used applications. Our services scale on demand and offer high availability at all times.
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How much mobile bandwidth does the Sinch SDK use?
It depends on the type of calls - voice app-to-app, video app-to-app, or app-to-phone. Need more details? Contact us to get a copy of our guide!
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Does the Sinch SDK work behind symmetric NATs?
The Sinch SDK uses P2P for the voice stream when possible. We use the ICE standard for NAT traversal. If a P2P channel isn’t possible - for example when both sides are behind a symmetric NAT - the voice channel will fall back to Sinch media proxies. 70-75% of calls made will go over P2P, and 25-30% will go through servers due to firewall restrictions.